Syringe



March 17, 1936. R c. ANGELI.

SYRINGE Filed Feb. l5, 1935 4 Sheets-Sheet l March 17, 1936. R, Q ANGELI.

SYRINGE l935 4 Sheets-Sheet 2 Filed Feb. 13

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SYRINGE Filed Feb. 13, 1933 4 Sheets-Sheet I5 V//fw/Vl:

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NNHLNIl NNN www Am www www www Patented Mar. 17, 1936 UNITED STATES PATENT OFFICE SYRINGE Application February 13, 1933, Serial No. 656,549

25 Claims.

My invention relates particularly to that class of syringes that are adapted to be connected with a supply of Water Linder pressure and employed in the practice of dentistry, and is especially applicable to the type of syringe designed to delicately control under manual manipulation the flow of a thermally conditioned fluid, Whereby it may be directed at substantially body temperature into the oral cavity at any desired rate of flow.

The principal objects of my invention are to provide a syringe with means therein contained that will generate heat and so induct it into the uid therein as to insure a continuous flow therethrough of Warm uid from the instant that said syringe is actuated to eect projection of said fluid from its nozzle, and to maintain such flow of Warm iluid at a substantially uniform temperature throughout the period of use of said syringe.

Other objects of my invention are to provide a syringe With means to effect instantaneous full flow start and stop of fluid without any attendant drip, to so delicately control the flow of the fluid that it may be either delivered from the nozzle at a maximum capacity stream or in a .drop by drop manner; and to so control the stream direction that it may be squirted into the area to be iiushed with superior accuracy and precision.

Further objects of my invention are to provide a syringe in which there are no sliding joints, and consequently no packing is required to prevent leakage incident to Wear by use or to deterioration by nonuse, thus any tendency to develop fluid leaks is entirely eliminated.

My invention comprehends a syringe in Which the constituent parts of the fluid conduit are so yieldingly connected in fluid-tight relation as to permit such relative movement thereof that a valve Within said conduit may be actuated to control the iiuid ilow therethrough by means manipulated from without said conduit.

My invention includes a syringe having a iluid passageway terminating in a nozzle and extend- 45 ing therethrough which forms a continuation of the flexible conduit leading from the source of fluid supply, and which includes sections of iiexible tubing formed into readily removable and replaceable cartridge-like units. 00 My invention provides a syringe adaptable to the employment of readily interchangeable nozzle units such as are shown in United States Patent No. 1,599,998, which may be of any desired length or curvature and provided with any diameter of bore, and which may be so rotated about its axis as to permit the outlet orifice of its nozzle to be directed at any desired angle with respect to the plane of actuation of the operating or controlling lever of said syringe.

Specifically stated, the form of my invention as hereinafter described comprises a casing or sheath formed of relatively separable tubular members having a nozzle attachment terminal or tip and forming a chamber through Which a readily removable and replaceable fluid conduit embracing a heating element extends. Said conduit includes relatively stationary terminal elements and a relatively movable intermediate body carrying a valve into and out of operative engagement with a suitably provided valve seat in the nozzle attachment terminal, the intermediate body being connected in uid-tight relation With the respective terminal members by relatively short sections of flexible tubing which may respectively be stretched or compressed axially, as the case may be, by axial movement of said intermediate body, by Which the valve may be caused to engage or disengage its seat to control the ilovv of fiuid therethrough. The axial movement of said intermediate body may be conveniently elfected by a thumb actuated lever mounted to rock in a suitably provided mounting on the syringe casing, and so correlated with interposed connecting means that When said lever is pressed toward the syringe casing the intermediate body will be forced rearwardly to effect withdrawal of the valve from its seat to permit fluid to iioW therethrough to be emitted from the syringe nozzle.

My invention also includes all of the various novel features of construction and arrangement as hereinafter more definitely specified.

In the accompanying drawings, Figure 1 is a side elevational view of a syringe constructed in accordance with my invention; Fig. 2 is an enlarged central vertical sectional View of the syringe shown on Fig. 1 taken axially in the plane of its actuating lever, the nozzle and its connector being removed; Fig. 3 is an enlarged horizontal sectional View of the syringe as shown in Fig. 2, taken axially in a plane transverse and normal to the plane of the actuating lever, certain parts being shown in elevation and the nozzle attachment terminal together with the fluid controlling valve being removed for convenience of illustration; Fig. 4 is a plan view of the syringe as illustrated in Fig. 1; Fig. 5 is an enlarged central vertical sectional view of the syringe as illustrated in Fig. 2 but showing the parts shifted by depression of the thumb actuated lever to the operative position in which the valve is withdrawn from its seat to permit flow of fluid therethrough; Fig. 6 is a transverse vertical sectional View taken in the planes indicated by the staggered lineG-I in Fig. 2; Fig. l'I is a transverse vertical sectional View taken on a plane indicated by the line 1-1 in Fig. 2; Fig. 8 is a transverse vertical sectional View tak-en in a plane indicated bythe line 8-8 in Fig. 2; Fig. 9 is a perspective view of the valve plunger perY se; Fig. 10 is a perspective view` of the forward collar of the rearward yielding conduit connector cartridge structure; Fig. 11 is a perspective view of the rearward collar of said cartridge structure; Fig. 12 is a central vertical'longitudinal sectional View of the syringe as shown in Fig. 2, illustrating Ya modification of the valve actuating mechanism, certain parts being shownV in elevation for convenience of illustration; Fig. 13 is a fragmentary vertical longitudinal sectional elevational view of the syringe shown in Fig. 12, with the valve actuating parts in operative position to maintain the valve open; Fig. 14 is a fragmentary plan sectional View taken axially through the central region of the syringe shown in Fig. 12 on the line I4--I4 in said figure; Fig. 15

' is a transverse vertical sectional view taken on the line I-I5 in Fig. 12; Fig. 16 is a transverse vertical sectional View taken on the line IB-IB in Fig. 12; Fig. 17 is a plan view of the casing in which the valve actuating mechanism shown in Figs. 12 to 16 is enclosed to form a readily removable unit; Fig. 18 is an end elevational View of the casing shown in Fig. 1'7; Fig. 19 is a central vertical longitudinal sectional elevational view of the syringe as shown in Fig. 2, illustrating a further modification of the valve actuating mechanism; Fig. 20 is a fragmentary vertical longitudinal sectional elevational view of 'the syringe sho-wn in Fig. 19, with the valve actuating lever and its associated parts in operative position to maintain the valve open Fig. y2l is a fragmentary plan sectional View of the central section of the syringe taken on the line 2I--2I in Fig. V20; Fig. 22 is a fragmentary central vertical sectional view showing the rear end portion of the forward `casing shell with the rearward casing shell removed and the valve operating lever shifted to the position to clear the internal operative parts and thereby Vpermit their free removal; Fig. 23 is a transverse vertical sectional view taken on the line 23-23 in Fig. 20; Fig. 24 is a perspective view of the valveactuating slide block, as shown in Figs. 19 tov 23 inclusive; and Fig. 25 is a fragmentary central vertical sectional view taken axially through the syringe nozzle and its connector and showing its Vmeans o-f attachment to theV terminal tip of ,theV syringe body, which is shown in elevation for convenience of illustration.

In said figures, the casing or sheath I comprises the forward tubular shell 2 and the rearwardV tubular shell 3 connected together by the screw threads 5 `in such relation that the internally threaded rear end 6 of the shell 2 extends into the forward end of the shell 3, the opposite rotation of said shells 2 and 3 for relative engagement and'disengagement being facilitated by the knurled bands] and 8 on the shell 2 and the knurled band 9 on the shell 3, as best shown in Figs. 1 and 4.

The forward end of the shell 2 is provided with the internal screw threads I Il with which the nozzle supporting terminal or tipl I I, having the tapering free end I2, is threadedly engaged, said tip I I being provided with the external screw threads I4, and having at its inner end the internally screw-threaded enlarged bore I3 forming the valve chamber I5 with which the outlet passageway I6 communicates through the valve seat l'I.

Said valve seat I'I is formed of an annulus I9 of resilient material, such as soft rubber, mounted with a tubular thmble 20 which maintains the valve seat forming material in its proper form and prevents it from mushrooining or otherwise distorting when being forced into and seated' in the counterbore 2I adjoining the valve chamber I5. The inner surface of the bore of the annulus I9 is also protected and held to form by the liner tube 22, preferably formedY of metal, said tube terminating short of the inner wall of said annulus, and projecting forwardly into the passageway I6, thereby assisting in stabilizing said valve seat forming annulus I9, but leaving the valve seat II freely resilient.

Cooperative with the valve seat I'I is the valve plunger 23 comprising a recessed hollow body 25, having opposed slits 26 'extending forwardly from its open end and having fluid exit ports 21 extending from its recess 29 through its forward conical wall 30. As shown in Figs. 2, 5 and 9, the conical wall 3IJ merges into a forward conical projection 3| of much less angle of taper than the conical wall 30, which projection 3l terminates in the forwardly extending cylindrical stem 32 having the transverse screw-driver slot 33 in its free end.

It may be here noted that the valve plunger 23 is shaped intermediate of its ends to form contiguous relatively tapered distinctly separate conical surfaces, the conical surface of lesser taper extending within the valve seat I'I and being effective to control the rate of flow through the valve when opened, while the conical surface of greater taper serves to press upon the edge of the bore of the valve seat I1 for effectively closing said bore and stopping the flow of fluid therethrough.

I'he hollow slitted body 25 of the valve plunger 23 is provided with the external screw-threads 35 by which it is engaged with the internally threaded forward end of the valve actuating plunger tube 36 providing a conduit which extends rearwardly into` the casing or sheath I, and mounted for axial reciprocation.

` Said plunger tube 36 is provided with external enlargements of varying longitudinal extent which afford the flanges 31, 39 and 4i), and terminates approximately atV the longitudinal center of the rearward casing shell 3, and is also provided with the external screw-threads 4I disposed forward of but adjacent to the flange 31, and the external screw-threads 42 disposed rearward of but adjacent to the flange 43, the purpose of which flanges and screw threads will be hereinafter described.

The forward tubular shell 2 of the casing or sheath I is provided with a sleeve or tubular liner 43 having an inturned flange 45 at its inner o-r back end providing a bearing in which said plunger tube 35 slides and affording an abutment surface 45, and an outturned flange 41 at its forward end seated in the annular recess 49 in said shell 2 and held rigidly by the nozzle supporting tip II against the shoulder 50 formed by said recess.

The plunger tube 36 is slidably supported toward its forward end in the collar 5I having the forward threaded extension 52 in threaded engagement with the casing terminal or tip II and thereby secured thereto in fluid-tight relation against the packing gasket 53 of soft yielding material disposed in the annular recess 55 provided therefor in the inner face of said tip Said collar 5| is provided with the rearwardly extending relatively reduced nipple 59 having the circumferential bead 5l and also having the longitudinally disposed recesses 59 in effect forming fingers 60 of which two are indicated, although obviously one or several may be employed with equal facility.

Opposed to the collar 5|, and in cooperative, relatively movable relation therewith, is the collar 6| which is provided with the forwardly extending relatively reduced nipple 52 having the circumferential bead 63 and also having the 1ongitudinally disposed recesses forming fingers 66 which relatively interengage with the fingers 60 of the collar 5| by entering the recesses 59 of said collar, to in effect form a longitudinally expansible and collapsible cage.

The collar 9| is internally screw-threaded and engaged with the screw-threads 4| on the plunger-tube 35, and has the annular recess 91 forming a seat for the packing gasket E9 of soft yielding material which when pressed against the shoulder 'i9 formed by the flange 3l' affords a fluid-tight seal.

As shown in Figs. 2, 3 and 5, the nipples 59 and 62 of the respective collars 5| and 9| are connected in relatively movable fluid-tight relation by the short length of soft rubber tubing 'il surrounding the cage formed by the interengaging fingers 5) and G6 and having its respectively opposite ends engaged with the nipples and 62 respectively by the clamp bands or binders 'l2 and of any desired construction or material.

In order to support the soft rubber tube l! and to prevent an appreciable expansion in diameter due to the effect of fluid pressure within the syringe, said tube is surrounded throughout its length by the helical wire coil l5 which not only serves as a support for the tube 'il but affords a metal to metal sliding contact with the inner cylindrical wall of the tubular line 49, and thereby facilitates the longitudinal elongation and contraction of said tube ll when said collars 5l and Eil are relatively shifted.

The structure thus described comprising the collars 5| and 6| and their connecting short length of tubing 7| forms a readily removable and replaceable unit that may be appropriately termed a fluid seal cartridge structure of which two of similar construction are included in the syringe assembly.

The second fluid seal cartridge is located toward the back end of the syringe casing and within the axially adjustable sleeve or tubular liner 'lf3 which is in threaded engagement with the internal screw-threads ll in the rear end of the tubular casing shell 2 and extends rearwardly therefrom into the tubular casing shell 9, and terminates in the inturned flange '19.

The second or rearwardly disposed cartridge structure comprises the collar Si having the flange 82 slidably fitting in the liner l, and the forwardly projecting boss 93 serving as a nut and provided with a plurality of circumferential flats 85, see Fig. 10, affording wrench holds by which said collar may be rotated to engage its internally disposed threads 99 with the screwthreads 42 on the plunger tube 39, and force it against the flange 49 with the interposed leakproof gasket 81 disposed in the annular recess 88 in the forward face of said collar.

' Projecting rearwardly from said flange 82, said collar 8| is provided with a reduced nipple 99 having the bead 99 and being provided with longitudinally extended recesses 9| forming the circumferentially disposed fingers 92, similar to the fingers 59 on the collar 5| of the forward fluid seal cartridge.

Opposed to the collar Sl and in cooperative relatively movable relation therewith is the collar 93, see Fig. ll, which is provided with the forwardly extending relatively reduced nipple 99 having the circumferential bead 95, and also having the longitudinally disposed recesses 9d forining lingers 9i which enter the recesses 9i and relatively interengage with the fingers 92, to in effect form a longitudinally expansible and collapsible cage.

Said collar 99 includes the rearwardly extending flanged boss 98 serving as a nut and provided with a plurality of circumferential flats 99 affording wrench holds by which said collar may be rotated to engage its internally disposed screw-threads |99 with the threaded forward end of the hose connector |l|| and thereby draw the forward shoulder of said hose connector into fluid-tight engagement with the interposed gasket E92 disposed in the annular recess |93 in the rearward face of said collar 93. The collars 8| and 93 are connected to form a uid seal cartridge in a manner similar to the formation of lthe forwardly disposed cartridge, and embodies the soft rubber tubing 'i clamp bands or binders l2 and i3 and the protective helical wire coil 15,

and therefore, detailed description of those parts r will not be here duplicated.

As shown in Figs. 2 and 5, the collar 93 is retained and limited against rearward movement by engagement of its flange 94 with the inturned flange 'i9 of the liner i6 so as to resist the strain incident to the drag of the flexible hose pipe |95, which is engaged with the nipple |99 and connects the fluid passageway |01 extending through the syringe, with any suitable source of fluid supply under pressure.

As shown, particularly in Figs. 2, 5, 6, 7 and 8, the syringe is provided with an elongated heat radiating element |99 extending through the flexible hose pipe |95 and continuing through the passageway |91 and terminating near the forward end of said conduit. Said heat radiating element comprises an elongated slender flexible body formed of insulating material, preferably vulcanized rubber, through which an electric current conductor I I 9, preferably composed of a plurality of wire strands so as to render it flexible, extends.

Attached to the forward end of said conductor ill, preferably by solder, is a strand of electrical resistance wire of gold or other suitable metal, extending therefrom through the wall of the insulator forming the heat radiating element and being helically coiled thereabout in direct contact with the fluid in the passageway 91, and so connected as to complete the electric circuit to effect heating of said helically coiled resistance wire A soft rubber tip H2 is vulcanized over the end of the heat radiating element |99 after the conductor ||0 and the resistance wire i have been connected, to prevent the fluid from contacting with said conductor Ill).

In order to prevent the short circuiting of the electrical resistance wire by metallic contact with the wall of the conduit-forming plunger tube 39, said tube is provided with the tubular lining ||3 of electrical resistance material, which extends forwardly of the forward end of the heat radiating element |09 and projects rearwardly through the hose pipe connector |0| and into the hose pipe |05, as shown in Figs. 2 and 5. Said tubular lining is provided with the enlarged band forming a flange |I4 affording a shoulder which bears against the back end of the plunger tube 36 and said tubular lining is of such internal diameter as to afford a substantial annular passageway throughrwhich the fiuid being heated may pass to Ythe'syringe nozzle.

The mechanism by which the valve is actuated is located substantially central with respect to the length of the syringe and comprises the inverted saddle-like shoe or slide-block II5 embracing `the plunger tube 36 and provided with the transverse groove |I6, extending throughout its U-shaped inner surface, see Fig. '1, into which groove the fiange 39 on said plunger tube 36 extends, and said slide-block has the upwardly and rearwardly inclined forwardly disposed inclined surface II1 upon which the wedge-block I|9 slides.

Said wedge-block I I9 comprises the saddle-like structure having the correspondingly inclined surface |20 which slides upon said inclined surfacev I I1 and having its forward end slidingly abutted against the rear surface |22 of the tubular liner 43 in transversely slidable relation therewith, said slide-block ||9 being provided with the'longitudinally directed groove |23 in its upper surface.

It will be obvious that any depression of the wedge-block II9 tends to cause relative sliding of the opposed inclined surfaces I|1 and |20 of the slide-block |I5 and wedge-block |I6 respectively, which effects rearward movement of said slide-block I I5 and consequently a like movement of the plunger tube 36 and the valve plunger 23 carried thereby, in opposition to the spring |25 to effect withdrawal of said valve plunger 23 from its seat I1.

The spring E25 surrounds the elongated flange 31 on the plunger tube 36 and bears at its respectively opposite ends against the inturned flange 45 of the tubular liner 43 and the collar 6|, thereby normally tending to shift the plunger tube 36 forwardly to close the valve plunger 23 against the valve seat I1.

Actuation of the valve controlling mechanism is conveniently effected by pressing downward on the thumb actuated lever |26, which is arranged to rock on the pintle |21 carried by the ears or lugs |29 on the band |30 which girdles the inner end portion of the tubular shell 2 of the casing I. Said lever |26 is provided with the depending pin or projection |3| extending into the groove |28, and having its rounded free end so engagingthe wedge-block I I9 as to force it downwardly and by reason of its sliding engagement with the Vabutment surface 46 and the cooperation of its inclined surfaces |20 with the opposed inclined surfaces ||1 on the slide-block ||5, all of the parts connected with said slide-block will be moved rearwardly therewith to open the valve. Upon release of the lever |26, all of said parts will be reversely shifted by the spring |25 to effeet closing of said valve.

As shown in Figs. 2 and '1, the pintle |21 has the waist |33 into which the set-screw |35 extends so as to prevent accidental displacement of said pintle by reason of the rocking action of the lever |26 which is provided with the pocketed spring pressed plunger |36 tending to rock the lever |26 forwardly to constantly maintain the pin or projection I 3| in operative engagement with the wedge-block II9.

Any desired form of nozzle |31 may be employe in connection with the syringe assembly herein shown and described, but the nozzle connector |38, illustrated in Figs. 1, 4 and 25, is embodied in United States Patent No. 1,599,998, and therefore its detailed description is deemed to be unnecessary; however, it will be further referred to hereinafter.

It may be here noted that by reason of the yielding fluid-tight connection afforded by the fluid seal cartridge units, the valve which is wholly contained within the fluid conduit may be readily and delicately controlled from without said conduit in such manner as to avoid the employment of any sliding joints that require to be periodically packed, or otherwise repaired, and that might at any time leak and cause irreparable damage and possible embarrassment to both the operator and patient.

The syringe embodying the modified form of my invention, as illustrated in Figs. 12 to 18 inclusive, is generally similar to the syringe illustrated in Figs. 1 to 11 inclusive except that the valve actuating mechanism is so encased to prevent the relative separation of its constituent parts, which permits said parts to be removed from and replaced in the syringe casing as a unit.

Enclosed within the syringe casing |39 comprising the forward tubular shell |40 having the anged liner |4|, and the rearward tubular shell |42 having the flanged liner |43, is the reciprocatory valve actuating plunger tube |45 which both serves as a conduit to convey fluid through the syringe and effects opening and closing of the valve depending upon its direction of movement, as in Figs. 2 and 5.

Said plunge-r tube |45 is provided with the collar |46 having the flange |41 snugly fitted for reciprocation in the liner |4I, and the collar |40 having the fiange |50 snugly fitted for reciprocation in the liner |43, and said plunger tube I45is also provided with the circumferential flange I5| intermediate of said collars |46 and |49.

The mechanism by which the valve operating plunger tube |45 `is actuated comprises the saddlelike shoe or slide-block |52 embracing the plunger tube |45 and having the transverse groove |53, extending throughout its U-shaped inner surface, and into which the flange |5| extends. VSaid slide-block |52 has the forward inclined surface |55 upon which the wedge-block |56 slides.

Said wedge-block |56 comprises the saddle-like structure having the correspondingly inclined surface |51 which slides upon said inclined surface |55 and having its forward end slidingly abutted against the rear surface |59 of the annular collar |60 to which the tubular sub-casing I6| is secured by the rivet |62, to provide a container for the valve actuating mechanism, and by which its constituent parts are retained on the plunger tube as a unit.

As shown particularly in Figs. 14 to 18 inclusive, the collar |60 is provided with rearwardly extending peripherally disposed segmental projections |63 fitted into corresponding recess |54 in the tubular sub-casing I6|, and said collar is also provided with diametricallyopposite channels |65 into which the forwardly projecting extensions |66 are fitted, through one of which the rivet |62 extends, see Figs. 1'1 and 18.

The sub-casing I6| of the valve actuating mechanism is provided with the longitudinally extended slot |61 which registers with a similarly directed slot |69 in the forward shell |40, and through which said registered slots |67 and |69 the depending projection |78 of the thumb lever |7| extends into operative engagement with the wedge-block |58, whereby it may be forced down- Wardly, and by cooperation of the opposed inclined surfaces |55 and |57, the slide-block |52 and plunger tube are forced rearwardly to effect opening of the valve.

The thumb actuated lever l7| is mounted to rock on the pintle |72 extended through suitably provided alined apertures in the ears or lugs |73 which project upwardly in parallel relation from the band |75 girdling the forward casing shell |40.

The forward end of the tubular sub-casing I6 and its associated collar |69, abut against the rear end of the flanged liner ili and is prevented from rotation or being forced rearwardly by the set-screw |75 which has its head embedded in the countersunk aperture |77 in the wall of the casing shell |40, and which extends in threaded. engagement with the collar |58.

The collar |58 affords an abutment for the spiral spring |79 which bears at its forward end against the collar |45 and thereby tends to thrust the plunger tube forwardly to close the valve and to return the valve actuating lever |7| and its associated parts, including the slide-block |52 and wedge-block |58, from the open valve position shown in Fig. 13 to the closed valve position shown in Fig. 12.

It may be here noted that in this form of my invention, removal of the internal working parts of the syringe for repair or replacement may be conveniently effected after removal of the setscrew |76, and that by reason of the fact that the slide-block |52 and wedge-block |55 are enclosed in the sub-casing |8|, they are prevented from accidental separation and are maintained intact with the plunger tube |45 until such time as the sub-casing |6| has been slipped forwardly therefrom.

The syringe embodying a further modified form of my invention, as illustrated in Figs. 19 to 24 inclusive, is similar in mest respects to the syringe illustrated in Figs. 1 to 11 inclusive and hereinbefore described except as applied to valve actuating mechanism to which the description immediately following will specifically apply.

Enclosed within the syringe casing |8| comprising the forward tubular shell |82, having the longitudinal slit |83, and the rearward tubular shell |85 connected together by the screw threads |86, and partially covering said slit |83, is the valve actuating plunger tube |87, having the flange |89, and mounted to reciprocate in the tubular liner |98 having the inturned ange |9| affording an abutment and also providing a slide bearing for said plunger tube |87 which is normally thrust forwardly to close the valve of the syringe by the helically coiled spring |92.

Mounted upon the plunger tube |87, between the abutment ange |9| and the flange |89, is a saddle-formed block |93, best shown in perspective in Fig. 24, and comprising the elongated aperture |95, in its uppermost wall, against the rear end surface of which the depending hooklike finger |96 depending from the thumb operated lever |97 bears.

Said thumb operated lever |97 is mounted to rock on the pintle |99 which extends through suitably alined apertures in the ears or lugs 200 and which is prevented from accidental displacement by the set-screw 20| having the pocket 202 for the spring 203 which so tends to rock the lever |97 as to maintain the finger |95, which extends through the longitudinally disposed slit |83, in engagement with said block |93. Said ears or lugs 200 project upwardly from the band 205 which girdles the rearward end of the forward tubular shell |82 of the syringe casing |8|.

In the normally inoperative or closed valve position of the syringe parts, as shown in Fig. 19, the block |98 rests against the abutment flange |9|, as shown in Fig. 19, but any downward movement of the `lever |97 causes the finger to rock through the slit |83 in an arc about the axis of the pintle |99 and thereby shifts the block |93 rearwardly in contact with the flange |89 to retract valve actuating plunger tube 87 in opposition to the spring |92, as indicated in Fig. 20.

The movement of the lever 97 beyond its normally inoperative position is limited by the buffer 206 provided by extending the rear end of said lever downwardly to engage the tubular shell |85 of the syringe casing |8|, and in such position, as will be obvious, the internal parts of the syringe could not be withdrawn for repair or replacement, due to the fact that the finger |98 extends into the path of the block |93.

As illustrated in Fig. 22, the slit |83 is of such longitudinal extent that when the rearward tubular shell |85 is backed off or removed from the forward tubular shell |82, the lever |97 may be rocked into such position that both the finger |95 and the buffer 288 of said lever terminate within the slit |83 and so free the parts within the casing 8| as to permit them to be readily withdrawn forwardly therefrom.

In the form of my invention illustrated in Figs. 19 to 24 inclusive, the actuation of the lever |97 effects a direct axial rearward thrust of the block |93 against the flange |89 of the valve actuating plunger tube |87 and thereby tends to simplify the construction by elimination of the inclined plane sliding action of the slideblock and wedge-block, as hereinbefore described.

As illustrated in Fig. 25, the nozzle |37 and its connector |38, hereinbefore briefly referred to, is detachably connected with the terminal tip said connector being threadedly engaged with the screw threads |4 thereon. The nozzle 37 has the enlarged counter-bore 209 tapered to snugly fit the forward tapered free end |2 of the terminal tip upon which it is tightly held by the fingers 2|0 and 2|| of said connector |38 engaging the shoulder 2|2 formed by the enlarged head or flange 2|3 at the back or inner end of said nozzle |37.

It may be here noted that although the nozzle |37 is so tightly held on the terminal tip by the ngers 2|0 to afford a leak-tight joint, it is obvious that as the shoulder 2| 2 encircles the nozzle body, said nozzle may be rotated relative to the terminal tip to direct its deilected end, and consequently, the stream of fluid emitted therefrom in any desired direction.

My invention is advantageous in that all of the relatively movable sections or parts of the syringe structure through which the fluid is directed are so rigidly connected in fluid-tight relation that the possibility for leakage ofthe fluid passing therethrough is reduced to a minimum; furthermore, the fluid conduit sections and syringe parts are so correlated that they may be readily taken apart and assembled so as to afford easy repair and replacement.

I do not desire to limit my invention to the precise details of construction and arrangement as herein 'set forth, as itis obvious that various modifications may be made therein without departing from the essential features of my invention as defined in the appended claims.

Having thus described my invention, I claim: 1. A syringe of the class described, having a conduit forming a fluid passageway and coinprising a plurality of relatively movable sections having their'adjacent ends relatively separated and yieldingly connected in fluid-tight relation to for-rn an imperforate fluid conveyer, and a valve connected with one of the sections and arranged to'be actuated to open or close said passageway byrelative movement of said section.

2. A Asyringe of the class described,Y having a conduit forming a fluid passageway and comprising a plurality of relatively movable sections having their adjacent ends relatively separated and yieldingly connected in fiuid-tight relation to form an imperforate fluid conveyer, a valve connected with one of the sections and arranged to be actuated to open or close said passageway by relative movement of the section to which said valve is connected, and means arranged to move said section.

3. A syringe of the class described, having a conduit forming a fluid passageway therethrough and comprising a plurality of relatively movable sections having their adjacent ends relatively separated and yieldingly connected in fluidtight relation, 'a valve in said passageway connected with one of said sections and arranged to be actuated to open or close said passageway by relative movement of said section, a casing enclosing said conduit, and manually actuated means mounted on said casing operative to effect movement of the movable section to which said valve is connected.V

4. A syringe of the class described, having a casing provided with a valve seat and having a fluid-tight conduit extending through said casing andV forming a fluid passageway therethrough, saidconduit comprising a plurality of relatively movable sections having their adjacent ends relatively separated and yieldingly connected in huid-tight relation, "a valve plunger connected with one of' said sections and arranged to be actuated to engage or disengage said seat to effect opening or closing of" said passageway by relative movement of said section, means comprising relatively slidable members embracing said conduit andY having opposed inclined surfaces cooperatively associated to effect movement of said movable section, and manually actuated means mounted o'n said casing arranged to effect such relatively sliding movement of said members and consequent movement of said movable section and its connected valve plunger;

' 5. A syringe of the class described, having aV conduit forminga fluid passageway therethrough and comprising a plurality of alternately rigid and yielding relatively movable sections having their adjacent ends relatively separated and yieldingly connected in fluid-tight relation, a valve connected with one of the sections and arranged to be actuated to open or close said passageway by the relative movement of said section.

6. VA syringe of the class described, having a fluid-tightconduit affording a fluid passageway and comprising a plurality of relatively movable sections yieldingly secured together in relatively separated relation to form sealed joints between each section, and a valve controlling said passageway' and connected with o'ne of the sections. i "7. 'A syringe of the class described, comprising a conduit affording a fluid passageway connecting a source of fluid supply with its nozzle and having relatively movable' component parts yieldingly joined in relatively separated fluid-tight relation at their region of junction, fiuid controlling means in said passageway connected with a movable part of said conduit and effective by movement of said part to open or close said passageway whereby delicate control of the fiuid is afforded without any sliding o'r packed joints.

8. A syringe of the class described, comprising a conduit affording a fluid passageway connecting a source of fluid supply with its nozzle and having relatively movable component parts yieldingly joined in relatively separated fluid-tight relation at their region of junction, fluid controlling means in said passageway connected with a movable part of said conduit and effective by movement of said part to open or close said passageway, and manually actuated means arranged to effect movement of said movable part ofrsaid conduit.

9. A syringe of the class described, comprising a conduit affording a fluid passageway connecting a source of fluid supply with its nozzle and having relatively movable component parts yieldingly joined in relatively separated fluid-tight relation at their region of joining, fluid controlling means in said passageway connected with a movable part of said conduit and effective by movement of said part to open or close said passageway, means tending to yieldingly move said conduit part into position toi effect closing of said j passageway, and manually actuated means comprising relatively slidable saddle-like blocks embracing said conduit and arranged to move said conduit part to effect opening of the said passageway.

10. A syringe of Ythe class described,'comprising a conduit affording a fluid passageway connecting a so'urce of fluid supply with its nozzle and having relatively movable component parts yieldingly joined in fluid-tight relation to form an imperforate fluid conveyer, fluid controllingV means in said passageway connected with a mov-V able part of said conduit and effective by movement of said part to' open or close said passageway, a casing embracing said'conduit, manually r actuated means mounted on said casing operatively connected to effect movement of said movable part of said conduit whereby delicate control of the fluid is afforded without any sliding or packed fluid-conveying joints.

l1. A syringe of the class described, comprising a casing having a terminal outlet tip affording a valve seat, a conduit extended through said casing and having relatively movable component parts yieldingly poined in fluid-tight relation to connect a source of fiuid Supply with the terminal outlet, a valve plunger cooperative with said valve seat to control the flow of said fluid and connectedwith a movable part of said conduit to move therewith, and manually actuated means mounted on said casing and projecting through its wall into' cooperative relation with said movable part of said conduit operative to effect relative movement of said valve plunger and its seat.

12. A syringe of the class described, comprising a casing having a terminal outlet tip affording a valve seat, a conduit extended through said casing and having relatively movable component parts yieldingly joined in fluid-tight relation to connect a source of fluid supply with the terminal outlet, a valve plunger cooperative with said valve seat to control the flow of said iiuid and connected with a movable part of said conduit tol be moved therewith, means having an inclined surface mounted to move with said movable part, and manually operative means slidably cooperative with said inclined surface effective to move said movable part and consequent relative movement of said valve plunger and its seat.

13. A syringe of the class described, comprising a casing having a terminal outlet tip affording a valve seat, a conduit extended through said casing and having relatively movable component parts yieldingly joined in fluid-tight relation to connect a source of fluid supply with the terminal outlet, a valve plunger cooperative with said valve seat to control the flow of said fluid and connected with a movable part of said Aconduit to be moved therewith, a slide-block having an inclined surface movable with said movable part, a wedge-block transversely movable in said casing and arranged to slide on said inclined surface to effect longitudinal movement of said movable part and valve plunger, and manually actuated means mounted on said casing cooperative to effect transverse movement of said wedge-block and consequent longitudinal movement of said slide-block and the movable parts associated therewith.

14. A syringe of the class described, comprising a casing having a terminal outlet tip provided with a valve-seat, a conduit extending through said casing and having relatively movable component parte yieldingly joined in fluid-tight relation to connect a source of uid supply with the terminal outlet, a valve plunger cooperative with said valve-seat to control the flo-w of said fluid and connected with a movable part of said conduit to be moved therewith, yielding means tending'to thrust said valve toward its seat to close said passageway, a manually actuated lever mounted to rock on said casing and having a projection extending into said casing, and means cooperatively interposed between said projection and movable part of said conduit, operative when said lever is manually actuated, to eiiect movement of said valve plunger from its seat in opposition to said yielding means.

15. A syringe of the class described, comprising a casing having a terminal outlet tip provided with a valve-seat, a conduit extending through said casing and having relatively movable component parts yieldingly joined in uidtight relation to connect a source of iiuid supply with the terminal outlet, a valve plunger cooperative with said valve-seat to control the ilo-w of said uid and connected with a movable part of said conduit to be moved therewith, yielding means tending to thrust said valve toward its seat to close said passageway, a manually actuated lever mounted to rock on said casing and having a projection extending into said casing, and means cooperatively interposed between said projection and movable part of said conduit, operative when said lever is manually actuated, to eiect movement of said valve plunger from its seat in opposition to said yielding means, and a sub-casing surrounding said cooperatively interposed means arranged to hold said means captive with said conduit when it is removed from its casing.

l5. A syringe of the class described, comprising a casing having a terminal outlet tip provided with a valve-seat, a valve plunger cooperative with said seat and carried by a conduit extending through said casing to connect a source of uid supply with the terminal outlet, and comprising the central tube mounted for slight reciprocation in said casing and provided with relatively spaced collars secured thereon in uidtight relation in opposition to similar collars relatively spaced therefrom and held in rigid relation with said casing, iiexible tubing connecting the opposed collars in fluid-tight relation and permitting the reciprocatory movement of said tube to open and close the valve, and manually actuated means connected with said tube to effect its reciprocation and thereby control the iiuid flow therethrough.

17. A syringe of the class described, comprising a casing embracing a huid-tight conduit including inlet and outlet sections in stationary relation with said casing, and an intermediate relatively movable section connected with the respective inlet and outlet sections by fluid-tight cartridge-like units formed of flexible tubing and each having a collar engaged with said intermediate section and one having a collar engaged with said inlet section and the other having a collar engaged with said outlet section, means carried by said intermediate section to control the flow of fluid through said conduit, and manually actuated means carried by said casing cooperative with said intermediate section to eiect its movement.

18. A syringe of the class described, comprising a casing embracing a fluid-tight conduit including inlet and outlet sections in stationary relation with said casing, and an intermediate relatively movable section connected with the respective inlet and outlet sections by iluid-tight cartridge-like units formed of exible tubing and each having a collar engaged with said intermediate section and one having a collar engaged with said inlet section and the other having a collar engaged with said outlet section, means carried by said intermediate section to control the flow of fluid through said conduit, and manually actuated means carried by said casing cooperative with said intermediate section to eiect its movement and an elongated heating element extending through said conduit and terminating close to said outlet section.

19. A syringe of the class described, comprising a casing embracing a Huid-tight conduit including inlet and outlet sections in stationary relation to the casing, and an intermediate relatively movable section connected with the respective inlet and outlet sections by cartridge-like units of flexible tubing respectively having their relatively opposed ends rigidly connected in fluidtight relation to the oppositely directed ends of said intermediate section and their relatively oppositely directed ends rigidly connected in uid-tight relation, one to the inlet section and the other to the outlet section, and means carried by said intermediate section arranged to control the ilow of iiuid through said conduit in accordance with the axial movement of said intermediate section with respect to the other sections.

20. A syringe of the class described, comprising inlet and outlet sections and an intermediate relatively movable section connected with the respective inlet and outlet sections by flexible tubing one having its respective ends bound in huid-tight relation to the opposed ends of said inlet and intermediate sections and the other having its respective ends bound in Huid-tight relation to the opposed ends of said intermediate and inlet sections, means tending to advance said intermediate section and means connected with said intermediate section arranged to control the flow of iiuid through said conduit in accordance with the axial movement of said intermediate fsection With respect to the other sections.

' means actuated by the relative movement of said sections to control the iiow of fluid through said conduit.

22. A syringe ofthe class described, comprising a continuous imperforate tubular conduit formed of a plurality of relatively movable sections yieldingly connected and sealed together to afford a non-leakable fluid conveyer, a valve seat within said conduit, a valve connected with one of said sections arranged to be moved thereby into and out of engagement with said seat, and means exterior to said conduit connected to relatively move said sections VWhere said valve may be actuated to open or close said valve.

23. A syringe of the class described, comprising a casing embracing a fluid-tight conduit including inlet and outlet sections in stationary relation With said casing, and an intermediate relatively movable section connected With the respective inlet and outlet sections by fluid-tight cartridge-like units formed of flexible tubing and each having a collar engaged with said intermediate section and one having a collar engaged with relatively spaced conduit sections, of a valveseat, a relatively movable 'conduit section disposed between said spaced sections, sections of elastic tubing connecting said spaced and movable sections and by reason of ktheir elasticity permitting a limited axial movement of said movable section with respect to said relatively spaced sections, and a valve cooperative with said valveseat ,to control the flow of fluid through said conduit, said valve being connected to Vbe actuated by the relative axial movement of said movable section to effect its opening and closing with respect to said seat.V

25. An article of manufacture, comprising a valve controlled conduit, the combination with relatively stationary and movable conduit sections, of a valve-seat disposed in one of said sections, a section of elastic tubing connecting said stationary and movable sections with its ends rigidly secured to the opposed ends of said sections, and a valve connected with the other of said sections and arranged to be actuated by the relative movement of said sections to open and close with respect to said seat, and thereby control the flow of fluid through said conduit.

ROBERT C. ANGELL. 

